The 2004 Copa Libertadores de América (officially the 2004 Copa Toyota Libertadores de América for sponsorship reasons) was the 45th edition of the Copa Libertadores, CONMEBOL's premier annual international club tournament.

This was the last Copa Libertadores in which the away goals rule would not be used in every two-legged knockout round. However, starting in the 2008 Copa Libertadores, the away goals rule was removed from the finals.